Soft Girl Name With Strong Sounding Nickname

I would like to find a girl name that is either very formal/old or very frilly sounding, something long or extravagant, but that has a very strong nickname that could be used for a tomboy or the like. I don't want it to sound like a boy's name, just a name that would be a strong/tough girl. I would prefer that the formal name start with either an A, or a D, though B's and C's are also appreciated. Best possible scenario would be if the nickname started with a T.

I have an older son named Caleb and am having twin girls this time. I've already decided on Beatrice, nickname Tris, for one but I need anther.